If your discussing a plant { an organism capable of photosynthesis ; botany : An important plant to me would most likely have healing properties, or be some sort of herb, vegetable, or fruit that would feed people. ->I had potatoes and meat for dinner. ->I used aloe vera for my sunburn I got from the beach.

I am guessing that it would be a plant that only grows in China. Unless you know a lot about plants, I suggest that you do some research first, then describe how the plant looks like, where it grows and what it is used for. Then say why this plant is important. For example, it might be used in traditional Chinese medicine.

When you say "plant," do you mean a place where industrial work happens (nuclear plants, manufacturing buildings, etc.)? If you do, and you aren't familiar with those types of places in your country, then I think your teacher would want you to try and research the topic. For example, when I searched "china manufacturing plants" using Google, I came up with Apple's plant, as well as many car manufacturing plants. When you describe it, some things you might want to list for the assignment might be: where the plant is located, what they build there and how that product is important to the world, how many people work for the plant, and why that plant is important to your country. Has it been in the news lately? Are they doing anything there that has caught people's attention?